void generate(OutputIterator first,
OutputIterator last,
Generator &generator,
command_queue &queue)
{
size_t size = std::distance(first, last);
typedef typename Generator::result_type g_result_type;
vector<g_result_type> tmp(size, queue.get_context());
vector<g_result_type> tmp2(size, queue.get_context());
uint_ bound = ((uint_(-1))/(m_b-m_a+1))*(m_b-m_a+1);
buffer_iterator<g_result_type> tmp2_iter;
while(size>0)
{
generator.generate(tmp.begin(), tmp.begin() + size, queue);
tmp2_iter = copy_if(tmp.begin(), tmp.begin() + size, tmp2.begin(),
_1 <= bound, queue);
size = std::distance(tmp2_iter, tmp2.end());
}
BOOST_COMPUTE_FUNCTION(IntType, scale_random, (const g_result_type x),
{
return LO + (x % (HI-LO+1));
});
inline InputIterator binary_find(InputIterator first,
InputIterator last,
UnaryPredicate predicate,
command_queue &queue = system::default_queue())
{
const device &device = queue.get_device();
boost::shared_ptr<parameter_cache> parameters =
detail::parameter_cache::get_global_cache(device);
const std::string cache_key = "__boost_binary_find";
size_t find_if_limit = 128;
size_t threads = parameters->get(cache_key, "tpb", 128);
size_t count = iterator_range_size(first, last);
InputIterator search_first = first;
InputIterator search_last = last;
scalar<uint_> index(queue.get_context());
// construct and compile binary_find kernel
binary_find_kernel<InputIterator, UnaryPredicate>
binary_find_kernel(search_first, search_last, predicate);
::boost::compute::kernel kernel = binary_find_kernel.compile(queue.get_context());
// set buffer for index
kernel.set_arg(binary_find_kernel.m_index_arg, index.get_buffer());
while(count > find_if_limit) {
index.write(static_cast<uint_>(count), queue);
// set block and run binary_find kernel
uint_ block = static_cast<uint_>((count - 1)/(threads - 1));
kernel.set_arg(binary_find_kernel.m_block_arg, block);
queue.enqueue_1d_range_kernel(kernel, 0, threads, 0);
size_t i = index.read(queue);
if(i == count) {
search_first = search_last - ((count - 1)%(threads - 1));
break;
} else {
search_last = search_first + i;
search_first = search_last - ((count - 1)/(threads - 1));
}
// Make sure that first and last stay within the input range
search_last = (std::min)(search_last, last);
search_last = (std::max)(search_last, first);
search_first = (std::max)(search_first, first);
search_first = (std::min)(search_first, last);
count = iterator_range_size(search_first, search_last);
}
return find_if(search_first, search_last, predicate, queue);
}
inline OutputIterator
set_symmetric_difference(InputIterator1 first1,
InputIterator1 last1,
InputIterator2 first2,
InputIterator2 last2,
OutputIterator result,
command_queue &queue = system::default_queue())
{
typedef typename std::iterator_traits<InputIterator1>::value_type value_type;
int tile_size = 1024;
int count1 = detail::iterator_range_size(first1, last1);
int count2 = detail::iterator_range_size(first2, last2);
vector<uint_> tile_a((count1+count2+tile_size-1)/tile_size+1, queue.get_context());
vector<uint_> tile_b((count1+count2+tile_size-1)/tile_size+1, queue.get_context());
// Tile the sets
detail::balanced_path_kernel tiling_kernel;
tiling_kernel.tile_size = tile_size;
tiling_kernel.set_range(first1, last1, first2, last2,
tile_a.begin()+1, tile_b.begin()+1);
fill_n(tile_a.begin(), 1, 0, queue);
fill_n(tile_b.begin(), 1, 0, queue);
tiling_kernel.exec(queue);
fill_n(tile_a.end()-1, 1, count1, queue);
fill_n(tile_b.end()-1, 1, count2, queue);
vector<value_type> temp_result(count1+count2, queue.get_context());
vector<uint_> counts((count1+count2+tile_size-1)/tile_size + 1, queue.get_context());
fill_n(counts.end()-1, 1, 0, queue);
// Find individual symmetric differences
detail::serial_set_symmetric_difference_kernel symmetric_difference_kernel;
symmetric_difference_kernel.tile_size = tile_size;
symmetric_difference_kernel.set_range(first1, first2, tile_a.begin(),
tile_a.end(), tile_b.begin(),
temp_result.begin(), counts.begin());
symmetric_difference_kernel.exec(queue);
exclusive_scan(counts.begin(), counts.end(), counts.begin(), queue);
// Compact the results
detail::compact_kernel compact_kernel;
compact_kernel.tile_size = tile_size;
compact_kernel.set_range(temp_result.begin(), counts.begin(), counts.end(), result);
compact_kernel.exec(queue);
return result + (counts.end() - 1).read(queue);
}
inline InputIterator binary_find(InputIterator first,
InputIterator last,
UnaryPredicate predicate,
command_queue &queue = system::default_queue())
{
size_t find_if_limit = 128;
size_t threads = 128;
size_t count = iterator_range_size(first, last);
while(count > find_if_limit) {
scalar<uint_> index(queue.get_context());
index.write(static_cast<uint_>(count), queue);
binary_find_kernel kernel;
kernel.set_range(first, last, predicate);
kernel.exec(queue, index);
size_t i = index.read(queue);
if(i == count) {
first = last - count%threads;
break;
} else {
last = first + i;
first = last - count/threads;
}
count = iterator_range_size(first, last);
}
return find_if(first, last, predicate, queue);
}
inline void sort2(const buffer &buffer, command_queue &queue)
{
const context &context = queue.get_context();
boost::shared_ptr<detail::program_cache> cache =
detail::get_program_cache(context);
std::string cache_key =
std::string("fixed_sort2_") + type_name<T>();
program sort2_program = cache->get(cache_key);
if(!sort2_program.get()){
const char source[] =
"__kernel void sort2(__global T *input)\n"
"{\n"
" const T x = input[0];\n"
" const T y = input[1];\n"
" if(y < x){\n"
" input[0] = y;\n"
" input[1] = x;\n"
" }\n"
"}\n";
sort2_program = program::build_with_source(
source, context, std::string("-DT=") + type_name<T>()
);
cache->insert(cache_key, sort2_program);
}
kernel sort2_kernel = sort2_program.create_kernel("sort2");
sort2_kernel.set_arg(0, buffer);
queue.enqueue_task(sort2_kernel);
}
inline void opengl_enqueue_release_buffer(const opengl_buffer &buffer,
command_queue &queue)
{
BOOST_ASSERT(buffer.get_context() == queue.get_context());
opengl_enqueue_release_gl_objects(1, &buffer.get(), queue);
}
inline vector<
typename boost::compute::result_of<
BinaryFunction(
typename std::iterator_traits<InputIterator>::value_type,
typename std::iterator_traits<InputIterator>::value_type
)
>::type
>
block_reduce(InputIterator first,
size_t count,
size_t block_size,
BinaryFunction function,
command_queue &queue)
{
typedef typename
std::iterator_traits<InputIterator>::value_type
input_type;
typedef typename
boost::compute::result_of<BinaryFunction(input_type, input_type)>::type
result_type;
const context &context = queue.get_context();
size_t total_block_count =
static_cast<size_t>(std::ceil(float(count) / 2.f / float(block_size)));
vector<result_type> result_vector(total_block_count, context);
reduce(first, count, result_vector.begin(), block_size, function, queue);
return result_vector;
}
inline void gemm(const matrix_order order,
const matrix_transpose trans_a,
const matrix_transpose trans_b,
const int M,
const int N,
const int K,
const Scalar alpha,
device_ptr<Scalar> A,
const int lda,
device_ptr<Scalar> B,
const int ldb,
const Scalar beta,
device_ptr<Scalar> C,
const int ldc,
command_queue &queue)
{
(void) order;
(void) trans_a;
(void) trans_b;
::boost::compute::detail::meta_kernel k("gemm");
k.add_set_arg<Scalar>("alpha", alpha);
k.add_set_arg<Scalar>("beta", beta);
k.add_set_arg<const cl_uint>("M", static_cast<const cl_uint>(M));
k.add_set_arg<const cl_uint>("N", static_cast<const cl_uint>(N));
k.add_set_arg<const cl_uint>("K", static_cast<const cl_uint>(K));
k.add_set_arg<const cl_uint>("lda", static_cast<const cl_uint>(lda));
k.add_set_arg<const cl_uint>("ldb", static_cast<const cl_uint>(ldb));
k.add_set_arg<const cl_uint>("ldc", static_cast<const cl_uint>(ldc));
size_t a_index = k.add_arg<const Scalar *>("__global", "A");
size_t b_index = k.add_arg<const Scalar *>("__global", "B");
size_t c_index = k.add_arg<Scalar *>("__global", "C");
k <<
k.decl<cl_uint>("i") << " = get_global_id(0);\n" <<
k.decl<cl_uint>("j") << " = get_global_id(1);\n" <<
k.decl<Scalar>("sum") << " = 0;\n" <<
"for(uint k = 0; k < K; k++){\n" <<
" sum += " << A[k.expr<cl_uint>("i*lda+k")] << " * "
<< B[k.expr<cl_uint>("k*ldb+j")] << ";\n" <<
"};\n" <<
C[k.expr<cl_uint>("i*ldc+j")] << "=" <<
"alpha * sum + beta *" << C[k.expr<cl_uint>("i*ldc+j")] << ";\n";
const context &context = queue.get_context();
::boost::compute::kernel kernel = k.compile(context);
kernel.set_arg(a_index, A.get_buffer());
kernel.set_arg(b_index, B.get_buffer());
kernel.set_arg(c_index, C.get_buffer());
size_t work_group_offsets[] = { 0, 0 };
size_t work_group_sizes[] = { static_cast<size_t>(N),
static_cast<size_t>(M) };
queue.enqueue_nd_range_kernel(kernel,
2,
work_group_offsets,
work_group_sizes,
0);
}
inline TextIterator search_n(TextIterator t_first,
TextIterator t_last,
size_t n,
ValueType value,
command_queue &queue = system::default_queue())
{
// there is no need to check if pattern starts at last n - 1 indices
vector<uint_> matching_indices(
detail::iterator_range_size(t_first, t_last) + 1 - n,
queue.get_context()
);
// search_n_kernel puts value 1 at every index in vector where pattern
// of n values starts at
detail::search_n_kernel<TextIterator,
vector<uint_>::iterator> kernel;
kernel.set_range(t_first, t_last, value, n, matching_indices.begin());
kernel.exec(queue);
vector<uint_>::iterator index = ::boost::compute::find(
matching_indices.begin(), matching_indices.end(), uint_(1), queue
);
// pattern was not found
if(index == matching_indices.end())
return t_last;
return t_first + detail::iterator_range_size(matching_indices.begin(), index);
}
inline OutputIterator
adjacent_difference(InputIterator first,
InputIterator last,
OutputIterator result,
BinaryFunction op,
command_queue &queue = system::default_queue())
{
typedef typename std::iterator_traits<InputIterator>::value_type value_type;
if(first == last) {
return result;
}
if (first == result) {
vector<value_type> temp(detail::iterator_range_size(first, last),
queue.get_context());
copy(first, last, temp.begin(), queue);
return ::boost::compute::detail::dispatch_adjacent_difference(
temp.begin(), temp.end(), result, op, queue
);
}
else {
return ::boost::compute::detail::dispatch_adjacent_difference(
first, last, result, op, queue
);
}
}
inline T inner_product(InputIterator1 first1,
InputIterator1 last1,
InputIterator2 first2,
T init,
BinaryAccumulateFunction accumulate_function,
BinaryTransformFunction transform_function,
command_queue &queue = system::default_queue())
{
typedef typename std::iterator_traits<InputIterator1>::value_type value_type;
size_t count = detail::iterator_range_size(first1, last1);
vector<value_type> result(count, queue.get_context());
transform(first1,
last1,
first2,
result.begin(),
transform_function,
queue);
return ::boost::compute::accumulate(result.begin(),
result.end(),
init,
accumulate_function,
queue);
}
inline void serial_reduce(InputIterator first,
InputIterator last,
OutputIterator result,
BinaryFunction function,
command_queue &queue)
{
typedef typename
std::iterator_traits<InputIterator>::value_type T;
typedef typename
::boost::compute::result_of<BinaryFunction(T, T)>::type result_type;
const context &context = queue.get_context();
size_t count = detail::iterator_range_size(first, last);
if(count == 0){
return;
}
meta_kernel k("serial_reduce");
size_t count_arg = k.add_arg<cl_uint>("count");
k <<
k.decl<result_type>("result") << " = " << first[0] << ";\n" <<
"for(uint i = 1; i < count; i++)\n" <<
" result = " << function(k.var<T>("result"),
first[k.var<uint_>("i")]) << ";\n" <<
result[0] << " = result;\n";
kernel kernel = k.compile(context);
kernel.set_arg(count_arg, static_cast<uint_>(count));
queue.enqueue_task(kernel);
}
inline void sort_by_transform(Iterator first,
Iterator last,
Transform transform,
Compare compare,
command_queue &queue = system::default_queue())
{
typedef typename std::iterator_traits<Iterator>::value_type value_type;
typedef typename boost::compute::result_of<Transform(value_type)>::type key_type;
size_t n = detail::iterator_range_size(first, last);
if(n < 2){
return;
}
const context &context = queue.get_context();
::boost::compute::vector<key_type> keys(n, context);
::boost::compute::transform(
first,
last,
keys.begin(),
transform,
queue
);
::boost::compute::sort_by_key(
keys.begin(),
keys.end(),
first,
compare,
queue
);
}
inline InputIterator
adjacent_find_with_atomics(InputIterator first,
InputIterator last,
Compare compare,
command_queue &queue)
{
if(first == last){
return last;
}
const context &context = queue.get_context();
size_t count = detail::iterator_range_size(first, last);
// initialize output to the last index
detail::scalar<uint_> output(context);
output.write(static_cast<uint_>(count), queue);
detail::meta_kernel k("adjacent_find_with_atomics");
size_t output_arg = k.add_arg<uint_ *>(memory_object::global_memory, "output");
k << "const uint i = get_global_id(0);\n"
<< "if(" << compare(first[k.expr<uint_>("i")],
first[k.expr<uint_>("i+1")]) << "){\n"
<< " atomic_min(output, i);\n"
<< "}\n";
k.set_arg(output_arg, output.get_buffer());
k.exec_1d(queue, 0, count - 1, 1);
return first + output.read(queue);
}
inline TextIterator find_end(PatternIterator p_first,
PatternIterator p_last,
TextIterator t_first,
TextIterator t_last,
command_queue &queue = system::default_queue())
{
const context &context = queue.get_context();
vector<uint_> matching_indices(detail::iterator_range_size(t_first, t_last),
context);
detail::search_kernel<PatternIterator,
TextIterator,
vector<uint_>::iterator> kernel;
kernel.set_range(p_first, p_last, t_first, t_last, matching_indices.begin());
kernel.exec(queue);
using boost::compute::_1;
vector<uint_>::iterator index =
detail::find_end_helper(matching_indices.begin(),
matching_indices.end(),
_1 == 1,
queue);
return t_first + detail::iterator_range_size(matching_indices.begin(), index);
}
inline cv::Mat opencv_create_mat_with_image2d(const image2d &image,
command_queue &queue = system::default_queue())
{
BOOST_ASSERT(image.get_context() == queue.get_context());
cv::Mat mat;
image_format format = image.get_format();
const cl_image_format *cl_image_format = format.get_format_ptr();
if(cl_image_format->image_channel_data_type == CL_UNORM_INT8 &&
cl_image_format->image_channel_order == CL_BGRA)
{
mat = cv::Mat(image.height(), image.width(), CV_8UC4);
}
else if(cl_image_format->image_channel_data_type == CL_UNORM_INT16 &&
cl_image_format->image_channel_order == CL_BGRA)
{
mat = cv::Mat(image.height(), image.width(), CV_16UC4);
}
else if(cl_image_format->image_channel_data_type == CL_FLOAT &&
cl_image_format->image_channel_order == CL_INTENSITY)
{
mat = cv::Mat(image.height(), image.width(), CV_32FC1);
}
else
{
mat = cv::Mat(image.height(), image.width(), CV_8UC1);
}
opencv_copy_image_to_mat(image, mat, queue);
return mat;
}
/// Enqueues a command to release the specified OpenGL buffer.
///
/// \see_opencl_ref{clEnqueueReleaseGLObjects}
inline event opengl_enqueue_release_buffer(const opengl_buffer &buffer,
command_queue &queue,
const wait_list &events = wait_list())
{
BOOST_ASSERT(buffer.get_context() == queue.get_context());
return opengl_enqueue_release_gl_objects(1, &buffer.get(), queue, events);
}
inline void merge_sort_by_key_on_cpu(KeyIterator keys_first,
KeyIterator keys_last,
ValueIterator values_first,
Compare compare,
command_queue &queue)
{
typedef typename std::iterator_traits<KeyIterator>::value_type key_type;
typedef typename std::iterator_traits<ValueIterator>::value_type value_type;
size_t count = iterator_range_size(keys_first, keys_last);
if(count < 2){
return;
}
// for small input size only insertion sort is performed
else if(count <= 512){
block_insertion_sort(keys_first, values_first, compare,
count, count, true, queue);
return;
}
const context &context = queue.get_context();
const device &device = queue.get_device();
// loading parameters
std::string cache_key =
std::string("__boost_merge_sort_by_key_on_cpu_") + type_name<value_type>()
+ "_with_" + type_name<key_type>();
boost::shared_ptr<parameter_cache> parameters =
detail::parameter_cache::get_global_cache(device);
const size_t block_size =
parameters->get(cache_key, "insertion_sort_by_key_block_size", 64);
block_insertion_sort(keys_first, values_first, compare,
count, block_size, true, queue);
// temporary buffer for merge results
vector<value_type> values_temp(count, context);
vector<key_type> keys_temp(count, context);
bool result_in_temporary_buffer = false;
for(size_t i = block_size; i < count; i *= 2){
result_in_temporary_buffer = !result_in_temporary_buffer;
if(result_in_temporary_buffer) {
merge_blocks(keys_first, values_first,
keys_temp.begin(), values_temp.begin(),
compare, count, i, true, queue);
} else {
merge_blocks(keys_temp.begin(), values_temp.begin(),
keys_first, values_first,
compare, count, i, true, queue);
}
}
if(result_in_temporary_buffer) {
copy(keys_temp.begin(), keys_temp.end(), keys_first, queue);
copy(values_temp.begin(), values_temp.end(), values_first, queue);
}
}
inline void opencv_copy_image_to_mat(const image2d &image,
cv::Mat &mat,
command_queue &queue = system::default_queue())
{
BOOST_ASSERT(mat.isContinuous());
BOOST_ASSERT(image.get_context() == queue.get_context());
queue.enqueue_read_image(image, image.origin(), image.size(), mat.data);
}
inline void serial_insertion_sort_by_key(KeyIterator keys_first,
KeyIterator keys_last,
ValueIterator values_first,
Compare compare,
command_queue &queue)
{
typedef typename std::iterator_traits<KeyIterator>::value_type key_type;
typedef typename std::iterator_traits<ValueIterator>::value_type value_type;
size_t count = iterator_range_size(keys_first, keys_last);
if(count < 2){
return;
}
meta_kernel k("serial_insertion_sort_by_key");
size_t local_keys_arg = k.add_arg<key_type *>(memory_object::local_memory, "keys");
size_t local_data_arg = k.add_arg<value_type *>(memory_object::local_memory, "data");
size_t count_arg = k.add_arg<uint_>("n");
k <<
// copy data to local memory
"for(uint i = 0; i < n; i++){\n" <<
" keys[i] = " << keys_first[k.var<uint_>("i")] << ";\n"
" data[i] = " << values_first[k.var<uint_>("i")] << ";\n"
"}\n"
// sort data in local memory
"for(uint i = 1; i < n; i++){\n" <<
" " << k.decl<const key_type>("key") << " = keys[i];\n" <<
" " << k.decl<const value_type>("value") << " = data[i];\n" <<
" uint pos = i;\n" <<
" while(pos > 0 && " <<
compare(k.var<const key_type>("key"),
k.var<const key_type>("keys[pos-1]")) << "){\n" <<
" keys[pos] = keys[pos-1];\n" <<
" data[pos] = data[pos-1];\n" <<
" pos--;\n" <<
" }\n" <<
" keys[pos] = key;\n" <<
" data[pos] = value;\n" <<
"}\n" <<
// copy sorted data to output
"for(uint i = 0; i < n; i++){\n" <<
" " << keys_first[k.var<uint_>("i")] << " = keys[i];\n"
" " << values_first[k.var<uint_>("i")] << " = data[i];\n"
"}\n";
const context &context = queue.get_context();
::boost::compute::kernel kernel = k.compile(context);
kernel.set_arg(local_keys_arg, static_cast<uint_>(count * sizeof(key_type)), 0);
kernel.set_arg(local_data_arg, static_cast<uint_>(count * sizeof(value_type)), 0);
kernel.set_arg(count_arg, static_cast<uint_>(count));
queue.enqueue_task(kernel);
}
/// Creates a new mersenne_twister_engine and seeds it with \p value.
explicit mersenne_twister_engine(command_queue &queue,
result_type value = default_seed)
: m_context(queue.get_context()),
m_state_buffer(m_context, n * sizeof(result_type))
{
// setup program
load_program();
// seed state
seed(queue, value);
}
inline void merge_sort_by_key_on_gpu(KeyIterator keys_first,
KeyIterator keys_last,
ValueIterator values_first,
Compare compare,
bool stable,
command_queue &queue)
{
typedef typename std::iterator_traits<KeyIterator>::value_type key_type;
typedef typename std::iterator_traits<ValueIterator>::value_type value_type;
size_t count = iterator_range_size(keys_first, keys_last);
if(count < 2){
return;
}
size_t block_size =
block_sort(
keys_first, values_first,
compare, count,
true /* sort_by_key */, stable /* stable */,
queue
);
// for small input size only block sort is performed
if(count <= block_size) {
return;
}
const context &context = queue.get_context();
bool result_in_temporary_buffer = false;
::boost::compute::vector<key_type> temp_keys(count, context);
::boost::compute::vector<value_type> temp_values(count, context);
for(; block_size < count; block_size *= 2) {
result_in_temporary_buffer = !result_in_temporary_buffer;
if(result_in_temporary_buffer) {
merge_blocks_on_gpu(keys_first, values_first,
temp_keys.begin(), temp_values.begin(),
compare, count, block_size,
true /* sort_by_key */, queue);
} else {
merge_blocks_on_gpu(temp_keys.begin(), temp_values.begin(),
keys_first, values_first,
compare, count, block_size,
true /* sort_by_key */, queue);
}
}
if(result_in_temporary_buffer) {
copy_async(temp_keys.begin(), temp_keys.end(), keys_first, queue);
copy_async(temp_values.begin(), temp_values.end(), values_first, queue);
}
}
inline void initial_reduce(InputIterator first,
InputIterator last,
buffer result,
const Function &function,
kernel &reduce_kernel,
const uint_ vpt,
const uint_ tpb,
command_queue &queue)
{
(void) function;
(void) reduce_kernel;
typedef typename std::iterator_traits<InputIterator>::value_type Arg;
typedef typename boost::tr1_result_of<Function(Arg, Arg)>::type T;
size_t count = std::distance(first, last);
detail::meta_kernel k("initial_reduce");
k.add_set_arg<const uint_>("count", uint_(count));
size_t output_arg = k.add_arg<T *>(memory_object::global_memory, "output");
k <<
k.decl<const uint_>("offset") << " = get_group_id(0) * VPT * TPB;\n" <<
k.decl<const uint_>("lid") << " = get_local_id(0);\n" <<
"__local " << type_name<T>() << " scratch[TPB];\n" <<
// private reduction
k.decl<T>("sum") << " = 0;\n" <<
"for(uint i = 0; i < VPT; i++){\n" <<
" if(offset + lid + i*TPB < count){\n" <<
" sum = sum + " << first[k.var<uint_>("offset+lid+i*TPB")] << ";\n" <<
" }\n" <<
"}\n" <<
"scratch[lid] = sum;\n" <<
// local reduction
ReduceBody<T,false>::body() <<
// write sum to output
"if(lid == 0){\n" <<
" output[get_group_id(0)] = scratch[0];\n" <<
"}\n";
const context &context = queue.get_context();
std::stringstream options;
options << "-DVPT=" << vpt << " -DTPB=" << tpb;
kernel generic_reduce_kernel = k.compile(context, options.str());
generic_reduce_kernel.set_arg(output_arg, result);
size_t work_size = calculate_work_size(count, vpt, tpb);
queue.enqueue_1d_range_kernel(generic_reduce_kernel, 0, work_size, tpb);
}
void exec_1d(command_queue &queue,
size_t global_work_offset,
size_t global_work_size)
{
const context &context = queue.get_context();
::boost::compute::kernel kernel = compile(context);
queue.enqueue_1d_range_kernel(kernel,
global_work_offset,
global_work_size);
}
inline void opencv_copy_image_to_mat(const image2d &image,
cv::Mat &mat,
command_queue &queue = system::default_queue())
{
BOOST_ASSERT(mat.isContinuous());
BOOST_ASSERT(image.get_context() == queue.get_context());
size_t origin[2] = { 0, 0 };
size_t region[2] = { image.width(), image.height() };
queue.enqueue_read_image(image, origin, region, 0, mat.data);
}
inline bool includes(InputIterator1 first1,
InputIterator1 last1,
InputIterator2 first2,
InputIterator2 last2,
command_queue &queue = system::default_queue())
{
typedef typename std::iterator_traits<InputIterator1>::value_type value_type;
int tile_size = 1024;
int count1 = detail::iterator_range_size(first1, last1);
int count2 = detail::iterator_range_size(first2, last2);
vector<uint_> tile_a((count1+count2+tile_size-1)/tile_size+1, queue.get_context());
vector<uint_> tile_b((count1+count2+tile_size-1)/tile_size+1, queue.get_context());
// Tile the sets
detail::tile_sets_kernel tiling_kernel;
tiling_kernel.tile_size = tile_size;
tiling_kernel.set_range(first1, last1, first2, last2,
tile_a.begin()+1, tile_b.begin()+1);
fill_n(tile_a.begin(), 1, 0, queue);
fill_n(tile_b.begin(), 1, 0, queue);
tiling_kernel.exec(queue);
fill_n(tile_a.end()-1, 1, count1, queue);
fill_n(tile_b.end()-1, 1, count2, queue);
vector<uint_> result((count1+count2+tile_size-1)/tile_size, queue.get_context());
// Find individually
detail::serial_includes_kernel includes_kernel;
includes_kernel.tile_size = tile_size;
includes_kernel.set_range(first1, first2, tile_a.begin(), tile_a.end(),
tile_b.begin(), result.begin());
includes_kernel.exec(queue);
return find(result.begin(), result.end(), 0, queue) == result.end();
}
inline event write_single_value(const T &value,
const buffer &buffer,
size_t index,
command_queue &queue)
{
BOOST_ASSERT(index < buffer.size() / sizeof(T));
BOOST_ASSERT(buffer.get_context() == queue.get_context());
return queue.enqueue_write_buffer(buffer,
index * sizeof(T),
sizeof(T),
&value);
}
inline image2d opencv_create_image2d_with_mat(const cv::Mat &mat,
cl_mem_flags flags,
command_queue &queue = system::default_queue())
{
const context &context = queue.get_context();
const image_format format = opencv_get_mat_image_format(mat);
image2d image(context, mat.cols, mat.rows, format, flags);
opencv_copy_mat_to_image(mat, image, queue);
return image;
}
inline OutputIterator scan_on_cpu(InputIterator first,
InputIterator last,
OutputIterator result,
bool exclusive,
command_queue &queue)
{
if(first == last){
return result;
}
typedef typename
std::iterator_traits<InputIterator>::value_type input_type;
typedef typename
std::iterator_traits<OutputIterator>::value_type output_type;
const context &context = queue.get_context();
// create scan kernel
meta_kernel k("scan_on_cpu");
k.add_arg<ulong_>("n");
k <<
k.decl<input_type>("sum") << " = 0;\n" <<
"for(ulong i = 0; i < n; i++){\n" <<
k.decl<const input_type>("x") << " = "
<< first[k.var<ulong_>("i")] << ";\n";
if(exclusive){
k << result[k.var<ulong_>("i")] << " = sum;\n";
}
k << " sum = sum + x;\n";
if(!exclusive){
k << result[k.var<ulong_>("i")] << " = sum;\n";
}
k << "}\n";
// compile scan kernel
kernel scan_kernel = k.compile(context);
// setup kernel arguments
size_t n = detail::iterator_range_size(first, last);
scan_kernel.set_arg<ulong_>(0, n);
// execute the kernel
queue.enqueue_1d_range_kernel(scan_kernel, 0, 1, 1);
// return iterator pointing to the end of the result range
return result + n;
}
inline OutputIterator copy_if_impl(InputIterator first,
InputIterator last,
OutputIterator result,
Predicate predicate,
bool copyIndex,
command_queue &queue)
{
typedef typename std::iterator_traits<OutputIterator>::difference_type difference_type;
size_t count = detail::iterator_range_size(first, last);
if(count == 0){
return result;
}
const context &context = queue.get_context();
// storage for destination indices
::boost::compute::vector<cl_uint> indices(count, context);
// write counts
::boost::compute::detail::meta_kernel k1("copy_if_write_counts");
k1 << indices.begin()[k1.get_global_id(0)] << " = "
<< predicate(first[k1.get_global_id(0)]) << " ? 1 : 0;\n";
k1.exec_1d(queue, 0, count);
// count number of elements to be copied
size_t copied_element_count =
::boost::compute::count(indices.begin(), indices.end(), 1, queue);
// scan indices
::boost::compute::exclusive_scan(indices.begin(),
indices.end(),
indices.begin(),
queue);
// copy values
::boost::compute::detail::meta_kernel k2("copy_if_do_copy");
k2 << "if(" << predicate(first[k2.get_global_id(0)]) << ")" <<
" " << result[indices.begin()[k2.get_global_id(0)]] << "=";
if(copyIndex){
k2 << k2.get_global_id(0) << ";\n";
}
else {
k2 << first[k2.get_global_id(0)] << ";\n";
}
k2.exec_1d(queue, 0, count);
return result + static_cast<difference_type>(copied_element_count);
}